Overview

Patrizio Tressoldi has established himself as one of parapsychology’s most prolific and methodologically rigorous researchers. His career is marked by a commitment to meta-analytic synthesis (bringing quantitative rigor to disparate experimental literatures) and by systematic innovation in experimental design, particularly the use of blinded and pre-registered protocols. His work spans the full spectrum of anomalous cognition and mind-matter interaction phenomena, from classical forced-choice card-guessing to contemporary remote viewing, mediumship, and consciousness studies.

Tressoldi’s approach is characterized by several hallmarks: a preference for large-scale meta-analyses that consolidate decades of scattered studies; careful attention to methodological controls, especially blinding and randomization; adoption of Bayesian statistical frameworks alongside frequentist analysis; and a willingness to investigate controversial phenomena (mediumship, channeling, out-of-body experiences) using the same rigorous standards applied in mainstream psychology. His work has made him a frequent collaborator with leading parapsychology researchers, including Lance Storm, Julia Mossbridge, Jessica Utts, and Dean Radin.

Life and career

Tressoldi has been based at the University of Padova’s Department of General Psychology, where he directs the Science of Consciousness Research Group. His research career has evolved across multiple domains of consciousness and anomalous cognition, but with a consistent emphasis on quantitative synthesis and methodological innovation.

His early work focused on forced-choice ESP paradigms and meta-analytic consolidation of the experimental literature. In 2010, he co-authored a landmark meta-analysis of free-response studies spanning 1992–2008, examining the noise-reduction model in parapsychology.⁸ This work established him as a leading figure in quantitative parapsychology and set the template for his subsequent meta-analytic projects.

Over the following decade, Tressoldi expanded his research portfolio to encompass remote viewing, mediumship, out-of-body experiences, and mind-matter interaction. He became a key collaborator in the Mossbridge-Utts meta-analysis of predictive physiological anticipation, contributing to the statistical and conceptual framework for understanding presentiment phenomena.⁹ He also co-authored with Daryl Bem a comprehensive meta-analysis of 90 experiments on anomalous anticipation of random future events, which yielded evidence exceeding the threshold for “decisive evidence” under Bayesian criteria.³

In recent years, Tressoldi has pioneered the use of registered reports and triple-blind protocols in mediumship research, establishing new methodological standards for studying controversial phenomena. He has also conducted systematic phenomenological investigations of out-of-body experiences induced by hypnotic suggestion, combining first-person accounts with neuroscientific correlates. His work on mind-matter interaction has extended to proof-of-concept studies of distant mental influence on electronic devices, and his investigation of channeling has employed computational text analysis to test claims about the source of channeled information.

Research

Meta-analysis and forced-choice ESP

Tressoldi’s meta-analytic work has been foundational to contemporary parapsychology. His 2010 meta-analysis of free-response studies established methodological standards for synthesizing decades of scattered experiments.⁸ He extended this work to forced-choice designs, collaborating with Lance Storm on a comprehensive update covering 1987–2022. This meta-analysis examined 141 studies using card symbols, pictures, and letters as targets. The combined dataset yielded a mean effect size of 0.02 (Stouffer Z = 8.52, p < 10⁻¹⁶), confirming that forced-choice designs successfully demonstrate ESP, albeit with a small effect.¹ Notably, the analysis found no evidence of decline in effect size over the 36-year period, and no significant differences between telepathy, clairvoyance, and precognition studies.

Remote viewing

Tressoldi has conducted the most comprehensive meta-analysis of remote viewing to date. His 2023 systematic review and meta-analysis examined 36 studies spanning 1974–2022, with a total of 40 effect sizes. Both frequentist and Bayesian meta-analyses revealed a strong average effect size of 0.34 (95% CI: 0.22–0.45), corresponding to a 19.3% difference in hit scores above chance expectation.² The analysis found no signs of publication bias and minimal decline effect. Importantly, remote viewing protocols demonstrated clear superiority over other ESP experimental methods, establishing remote viewing as the most efficient approach for studying extrasensory perception in both experimental and practical applications.

Tressoldi has also surveyed contemporary remote viewing practitioners and experts to document current methodologies and applications.¹⁰ More recently, he collaborated with expert remote viewers to synthesize consensus guidelines on optimal procedures, training requirements, environmental conditions, and blinding protocols for remote viewing research.¹¹

Anomalous anticipation and precognition

Tressoldi has been instrumental in meta-analytic work on anomalous anticipation phenomena. He co-authored the Mossbridge-Utts meta-analysis of predictive physiological anticipation preceding seemingly unpredictable stimuli, examining evidence for anticipatory activity in the autonomic nervous system.⁹ He also co-authored with Daryl Bem a meta-analysis of 90 experiments on anomalous anticipation of random future events, examining behavioral and cognitive responses that appear to precede randomly selected stimuli. The combined database yielded an overall effect greater than 6 sigma (z = 6.40, p = 1.2 × 10⁻¹⁰), with a Bayes Factor of 5.1 × 10⁹, greatly exceeding the criterion for “decisive evidence.”³ When Bem’s original experiments were excluded, independent replications still yielded a Bayes Factor of 3,853, supporting the robustness of the effect.

Mediumship and channeling

Tressoldi has pioneered rigorous experimental investigation of mediumship using triple-blind protocols. In a registered report, he and colleagues tested whether self-defined mediums could retrieve information about deceased persons without conventional means of access. The experimental design ensured complete separation between mediums and sitters, with sitters blind to which of two readings corresponded to their requested deceased person.¹² Results showed that mediums obtained 6–14% more correct information than expected by chance, with better performance among mediums preliminarily screened for ability.⁴ A meta-analysis of mediumship studies using forced-choice designs confirmed these findings across multiple laboratories.¹³

Tressoldi has extended this work to mediumship for deceased pets, demonstrating that the same triple-blind protocol yields comparable accuracy rates (63.1% correct identification) as mediumship for humans.¹⁴ He has also conducted a comprehensive review of methodological standards for mediumship and channeling research, identifying best practices for blinding, control conditions, and statistical analysis.¹⁵

In a novel investigation of channeling, Tressoldi tested whether information purportedly from identical spiritual entities channeled by different mediums would show content similarity. Using computational text analysis and human expert evaluation, he found low content similarity across mediums, suggesting that channeled information originates from the mediums’ own dissociative consciousness rather than from external entities.⁷

Out-of-body experiences

Tressoldi has conducted systematic phenomenological investigations of out-of-body experiences (OBEs) induced by hypnotic suggestion. In a qualitative study of 13 participants, he documented detailed first-person accounts of OBE phenomenology, finding that experiencers report a consciousness status characterized by high self-awareness without self-boundaries, perception across multiple sensory modalities, positive emotions, and a timeless dimension.⁵ He has also developed the Out-of-Body Level of Experience Scale, a validated instrument for measuring the depth and quality of OBE phenomenology.¹⁶

Tressoldi’s work on OBEs has examined both spontaneous and hypnotically induced experiences, comparing their phenomenological characteristics.¹⁷ He has also investigated whether OBE induction can enhance performance on remote viewing tasks, exploring the relationship between altered states of consciousness and anomalous perception.¹⁸

Mind-matter interaction at distance

Tressoldi has conducted experimental investigations of distant mental influence on electronic devices. In a pre-registered proof-of-concept study, he tested whether participants could mentally influence the output of a true random number generator from a distance. Thirteen participants completed 100 trials, each consisting of three 15-minute samples (pre-interaction, interaction, and post-interaction). Analysis revealed a 50% increase in the number of samples showing statistical anomalies during mental interaction compared to control conditions.⁶ Although the effect remains small, Tressoldi argues it represents a proof-of-concept for the construction of electronic devices susceptible to distant mental influence.

Tressoldi has also collaborated on theoretical work examining the physical mechanisms by which mind might influence matter at a distance. In a paper co-authored with Pederzoli and colleagues, he proposed that mind-matter interaction with random number generators may occur through the production of electron-gap pairs in Zener diodes, with the mediating energy consisting of photons in the near-infrared range.¹⁹

Consciousness and extraordinary human experiences

Tressoldi has conducted broader investigations into consciousness and extraordinary human experiences. He examined references cited in winning essays from the Bigelow Institute for Consciousness Studies contest on the survival of consciousness hypothesis, finding that near-death experiences were the most frequently cited category of evidence.²⁰ He has also surveyed scientists about spiritually transformative experiences and their implications for understanding the nature of consciousness and reality.²¹

His work on advanced meditation experiences explores phenomenological accounts of extraordinary states of consciousness and their relationship to theories of mind-brain interaction.²² He has also investigated shared death experiences, phenomena reported by individuals present at the moment of another person’s death, as a window into consciousness and the dying process.²³

Anomalous cognition and problem-solving

Tressoldi has explored the relationship between anomalous cognition and creative problem-solving. In a study examining the role of insight strategies in solving Compound Remote Associates problems, he found that completely masked solutions improved accuracy when participants adopted insight-like strategies, suggesting that intuitive processing may facilitate psi-related creative problem-solving.²⁴

Influence and reception

Tressoldi’s meta-analytic work has become foundational to contemporary parapsychology. His forced-choice meta-analysis is widely cited as the definitive quantitative synthesis of card-guessing and symbol-identification studies, and his remote viewing meta-analysis has established remote viewing as the most efficient ESP paradigm. His work is regularly cited in reviews of anomalous cognition research and has influenced methodological standards across the field.

His pioneering use of registered reports and triple-blind protocols in mediumship research has set new standards for experimental rigor in the study of controversial phenomena. The triple-blind mediumship protocol has been adopted by other laboratories and is increasingly recognized as a best-practice standard for eliminating sources of bias in mediumship research.

Tressoldi’s collaborative work with leading parapsychologists (Storm, Mossbridge, Utts, Radin) has positioned him as a central figure in contemporary quantitative parapsychology. His contributions to Bayesian meta-analysis have also influenced statistical practice in the field, promoting the adoption of Bayesian frameworks alongside frequentist approaches.

His work on consciousness, out-of-body experiences, and mediumship has attracted interest beyond parapsychology, with citations in consciousness studies, thanatology, and transpersonal psychology. His systematic phenomenological approach to extraordinary experiences has contributed to the emerging field of neurophenomenology and has influenced how consciousness researchers approach first-person data.

Tressoldi’s research has also generated critical engagement. His meta-analyses have been subject to scrutiny regarding inclusion criteria, effect-size estimation, and publication bias assessment, standard critical responses in quantitative research. His mediumship and channeling studies, while methodologically innovative, remain controversial, with skeptics questioning whether the observed effects can be attributed to conventional explanations such as cold reading or information leakage. Tressoldi has engaged these critiques through methodological refinement and transparency, publishing pre-registered protocols and detailed descriptions of blinding procedures.

Overall, Tressoldi’s career exemplifies a commitment to bringing quantitative rigor, methodological innovation, and statistical sophistication to parapsychology. His work has elevated the field’s standards for evidence synthesis and experimental design, and has demonstrated that controversial phenomena can be investigated using the same rigorous methods applied in mainstream science.